Segment and Related Information (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Integer	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 1,288	$ 1,263	$ 2,786	$ 2,703
Net income (loss)		19	344	(1,821)	898
Balance Sheet Data [Abstract]
Assets		36,759		36,759		$ 48,116
Segment (Numeric) [Abstract]
Goodwill		716		716		716
Kentucky Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		741	700	1,626	1,525
Net income (loss)		84	74	230	201
Financing Costs Allocated to Segment, Net of Tax			10		21
Income Taxes Allocated to Segment			2		4
Balance Sheet Data [Abstract]
Assets		16,282		16,282		15,943
Pennsylvania Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		537	554	1,142	1,162
Net income (loss)		96	118	209	236
Balance Sheet Data [Abstract]
Assets		13,814		13,814		12,347
Corporate and Other [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		10	9	18	16
Net income (loss)		(716)	(39)	(772)	(80)
Balance Sheet Data [Abstract]
Assets		6,663		6,663		843
DiscontinuedOperationsSegment
Income Statement Data [Abstract]
Net income (loss)		555	191	(1,488)	541
Balance Sheet Data [Abstract]
Assets		0		0		18,983
PPL Electric Utilities Corp [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		537	554	1,142	1,162
Net income (loss)	[1]	96	118	209	236
Balance Sheet Data [Abstract]
Assets		13,784		$ 13,784		12,324
Segment (Numeric) [Abstract]
Number of Reportable Segments | Integer				1
Number of Operating Segments | Integer				2
Louisville Gas And Electric Co [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		342	322	$ 770	729
Net income (loss)	[2]	45	47	120	120
Balance Sheet Data [Abstract]
Assets		7,380		7,380		7,345
Segment (Numeric) [Abstract]
Goodwill		389		$ 389		389
Number of Reportable Segments | Integer				1
Number of Operating Segments | Integer				1
Kentucky Utilities Co [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		411	388	$ 880	820
Net income (loss)	[3]	56	$ 53	142	$ 133
Balance Sheet Data [Abstract]
Assets		9,148		9,148		9,072
Segment (Numeric) [Abstract]
Goodwill		$ 607		$ 607		$ 607
Number of Reportable Segments | Integer				1
Number of Operating Segments | Integer				1

[1] Net income equals comprehensive income.

[2] Net income equals comprehensive income.

[3] Net income equals comprehensive income.